A Latvian Air Baltic pilot and three crew members have been pulled off a Greece-bound passenger plane in Oslo before take-off after failing a breathalyser test, Norwegian police say.

“Results of the breathalyser tests confirmed that four of the five crew members … were above the legal alcohol limit of 0.2 promille,” Romerike police prosecutor Edith Ek Sorensen said.

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The pilot, co-pilot and two stewardesses – all from Latvia and employed by Air Baltic – were taken into police custody and escorted to hospital for blood tests to confirm the breathalyser tests.

Results were expected later.

Sorensen said police had acted after receiving a tip-off from an anonymous caller about 4am.

The four risk up to two years in prison if found guilty.

Sorensen would not comment on the flight’s destination, but Norwegian daily Dagbladet said it was a tour group flight operated by the Norwegian group Startour headed for Chania, Greece, with 109 passengers on board.